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Articles 19231 - 19260 of 19480
Full-Text Articles in Earth Sciences
Stratigraphy And Organic Carbon Contents Of Glacial Deposits In The City Of Portage, Michigan, U.S.A., Nathaniel A. Barnes
Stratigraphy And Organic Carbon Contents Of Glacial Deposits In The City Of Portage, Michigan, U.S.A., Nathaniel A. Barnes
Masters Theses
The objectives of this study are to characterize the stratigraphy of the glacial drift in an area located in Portage, Michigan using four complete rotasonic cores, and to determine the variation of organic carbon content in the drift that may explain the high iron concentrations in the groundwater typically obtained in moderate to deep wells in southwestern Michigan. The four cores were characterized in detail in terms of lithology, textural and statistical analyses, gamma ray logging, S13C variation and organic carbon analyses. Clay minerals were characterized using X-ray diffraction analysis.
Results of this study identified two main diamicton …
Geosciences Newsletter - 2006, Department Of Geosciences
Geosciences Newsletter - 2006, Department Of Geosciences
Geological and Environmental Sciences News
Vol. 2, No. 2
- Mohamed Sultan, Chairperson
- Faculty News
- Department News
- Michigan Geological Repository for Research and Education (MGRRE)
- Department Updates
- Graduate Student News
- Awards & Graduations
- Alumni News
- Outstanding Alumni Academy
- Dedication Ceremony Michigan Geological Repository for Research and Education (MGRRE) New Faces in the Geosciences
Investigation Of Oxy-Anion Legand Adsorption Onto Surfaces Of Iron Oxide And Bacteria In Groundwater Aquifers, Haile Mengistu
Investigation Of Oxy-Anion Legand Adsorption Onto Surfaces Of Iron Oxide And Bacteria In Groundwater Aquifers, Haile Mengistu
Dissertations
We have measured adsorption of dissolved phosphate onto synthetic hydrous ferric oxide (HFO), dissolved arsenate and chromate onto the cell membrane of a bacterium species, S. putrefaciens as a function of pH, ionic strength, and relative concentrations of the respective oxy-ligands. Our experimental data were used to constrain optimal values for surface complexation reactions involving dissolved oxi-ligands (phosphate, and chromate) and the HFO surface and the cell membrane of S. putrefaciens respectively according to the diffuse layer model.
Our results provide a more accurate fit to experimental measurements over a broader range of pH (3 - 12), ionic strength and …
Thermodynamics Of Metals Adsorption Onto Uranium Dioxide, Koi Ling Lim
Thermodynamics Of Metals Adsorption Onto Uranium Dioxide, Koi Ling Lim
Masters Theses
Wastes and pollution containing uranium are released to the environment through mining, ore processing, industrial manufacture of nuclear fuel and weapons materials, and the disposal of spent nuclear fuel. There are a wide variety of processes that can affect UO2 stability. This research focuses on the surface reactivity of UO2 in reducing aqueous solutions, with an emphasis on assessment of the pH-dependent surface charge, reactive surface area, and the adsorption of dissolved lead (Pb), cadmium (Cd), lanthanum (La) onto UO2 particles. A surface complexation model was used to explain the adsorption and titration phenomena of UO2 …
Characterization Of Fracture Systems In Sublette County, Wyoming Using P-Wave And C-Wave 3d Seismic, Keith R. Johnson
Characterization Of Fracture Systems In Sublette County, Wyoming Using P-Wave And C-Wave 3d Seismic, Keith R. Johnson
Masters Theses
Birefringence of seismic shear waves has proven to be a useful tool for identifying fracture intensity and orientation in the subsurface. Naturally occurring fractures have been shown to contribute to the deliverability of natural gas production in some reservoir formations in Rocky Mountain sedimentary basins. A multicomponent 3D 3C seismic survey acquired on the southeastern end of Pinedale Anticline in Sublette County, Wyoming was mapped to characterize fault systems within the sedimentary section. The tectonic and depositional history in the study area was determined by literature search and by one-dimensional backstripping. Compressional and wrench fault systems were observed and mapped. …
Sedimentology And Stratigraphy Of The Pennsylvanian Saginaw Aquifer, Central Lower Michigan, U.S.A., Niah B. H. Venable
Sedimentology And Stratigraphy Of The Pennsylvanian Saginaw Aquifer, Central Lower Michigan, U.S.A., Niah B. H. Venable
Masters Theses
The Saginaw Aquifer is an important bedrock aquifer serving the needs of over 400,000 people in the Tri-County area of the Central Lower Peninsula of Michigan. The aquifer is comprised of the Pennsylvanian Grand River and Saginaw Formations. This study focuses on expanding existing knowledge of the general sedimentologic and stratigraphic characteristics of these units using conventional geological methods including core analysis, local log to core correlation, local and regional log to log correlation, and biostratigraphy. Analysis of new core from the study area examines facies and depositional environments given cursory coverage in outcrop studies by past researchers.
Incised valley …
Field Studies Of Hydrophobic Filter Pack Performance In Free Product Monitoring And Recovery, Nathan J. Brandner
Field Studies Of Hydrophobic Filter Pack Performance In Free Product Monitoring And Recovery, Nathan J. Brandner
Masters Theses
Multiple field experiments were conducted to determine the performance of hydrophobic filter packs, compared to the hydrophilic industry standard filter pack in free product hydrocarbon recovery. Laboratory and field studies have been previously performed in support of enhancing free product hydrocarbon recovery with the use of hydrophobic filter pack designs. This study was an attempt to test the efficacy of using hydrophobic filter pack materials to enhance free product recovery.
Six recovery wells were installed at three field sites, each site utilizing a pair of recovery wells, one hydrophobic and one hydrophilic, to compare their performances. Fine-grained hydrophobic filter pack …
Competitive Effects Of Uranyl-Organic Complexes On U(Vi) Reduction By Shewanella Putrefaciens, Abraham M. Northup
Competitive Effects Of Uranyl-Organic Complexes On U(Vi) Reduction By Shewanella Putrefaciens, Abraham M. Northup
Masters Theses
Haas and DiChristina (2002) have demonstrated that Fe(III) reduction by the facultative Fe(III)-reducing bacterium S. putrefaciens is mediated by competitive speciation among dissolved organic ligands and functional groups on the cell surface. They also showed that rates of Fe(III) reduction by S. putrefaciens correlate with the thermodynamic stability constants of the Fe(III)-organic ligand complexes. S. putrefaciens can also use U(VI) as a terminal electron acceptor, coupling U(VI) reduction to growth. In this study, S. putrefaciens was incubated in experimental media containing U(VI) in the form of aqueous complexes with a variety of organic ligands that differ significantly in structure and …
Development Of A Web-Based Gis For Groundwater Exploration In Arid Lands, Nakul Manocha
Development Of A Web-Based Gis For Groundwater Exploration In Arid Lands, Nakul Manocha
Masters Theses
A three-fold exercise was conducted to assess the groundwater potentiality in the Eastern Desert (ED) of Egypt. First, a database was generated to host all relevant data sets in a GIS environment for a better understanding of the spatial relationships between these data sets. Co-registered digital mosaics were generated from relevant data sets including remote sensing (e.g., Landsat TM, SIR-C, SRTM, TRMM), geochemical (solute concentrations, O and H stable isotope composition), geological (geologic maps), and hydrological (lithology, depth to water table) data sets. Second, a web-based GIS interface (ArcIMS) was developed to provide a vehicle for data analysis, visualization, and …
Geosciences Newsletter - 2005, Department Of Geosciences
Geosciences Newsletter - 2005, Department Of Geosciences
Geological and Environmental Sciences News
Vol. 2, No. 1
- Mohamed Sultan, Chairperson
- Faculty News
- Emeriti News
- Department News
- Graduate Student News
- Awards & Graduations
- Alumni News
- Professional Meetings
- Outstanding Alumni Academy
- New Faces in the Geosciences
Resistivity, Induced Polarization, And Spontaneous Potential Study Of Part Of The Calvin 28 Oil Field, Cass County Michigan, Eric M. Larsen
Resistivity, Induced Polarization, And Spontaneous Potential Study Of Part Of The Calvin 28 Oil Field, Cass County Michigan, Eric M. Larsen
Masters Theses
Some hydrocarbon reservoirs have a documented reducing chimney, extending upward to the surface due to diffusion of hydrocarbon volatiles. This effect reportedly reduces the iron in the soil to magnetite and precipitates fine-grained pyrite if there is sufficient sulfur in the system. This study was conducted to test the detectability of the hypothetical chimney, using electrical geophysics in an environment of relatively recent glacial cover, known depth to an underlying petroleum reservoir, and known faulting.
The Calvin 28 oil field, in Cass County Michigan, is a middle Devonian domal field where reservoir rocks are draped over the central uplift block …
Investigating Nickel Partitioning In A Contaminant Aquifer, Suama Ndengu
Investigating Nickel Partitioning In A Contaminant Aquifer, Suama Ndengu
Masters Theses
Improved prediction of the transport and bioavailability of metals in contaminated sediments demands a better quantitative understanding of how metals partition between aqueous solutions and mineral phases. This research examines the partitioning of nickel in a contaminated aquifer from Grand Rapids, Ml. Contaminated aquifer sediments were examined using the five step Tessier et al. (1979) operationally defined sequential extraction procedure to determine the solid phase distribution of nickel in the aquifer sediments. Models used to guide remediation efforts at the contaminated site assume that Ni behavior can be predicted based on Ni adsorption onto ferrihydrite (HFO). Although sequential extraction results …
Seasonal Variability In Trace Metal Speciation And Vertical Redox Stratification Of Freshwater Lake And Marsh Sediments In The Kalamzoo River Watershed (Mi, Usa), Noah Tumusiime Ndenga
Seasonal Variability In Trace Metal Speciation And Vertical Redox Stratification Of Freshwater Lake And Marsh Sediments In The Kalamzoo River Watershed (Mi, Usa), Noah Tumusiime Ndenga
Masters Theses
This research was aimed at: 1) quantifying redox-sensitive parameters in order to study redox stratification of the upper freshwater sediments at Asylum Lake and Kleinstuck Marsh, 2) quantifying the speciation of metals (e.g., Pb, Mn, Fe, Cr, Cu, Zn, Co and Cd), particularly with respect to their association with Fe and Mn (hydr)oxide phases, and 3) assessing changes in redox stratification and metal speciation as a function of season in the sediments. Both the solid phase and sediment pore waters were collected to a depth of ~50cm. Pore waters were analyzed for redox-sensitive species and the sediment solid phase was …
An Investigation Of The Interlobate Area West Of Three Rivers, Michigan And Its Relationship To The Late Wisconsinan Glaciation Of Southwest Michigan, Scott J. Kendzierski
An Investigation Of The Interlobate Area West Of Three Rivers, Michigan And Its Relationship To The Late Wisconsinan Glaciation Of Southwest Michigan, Scott J. Kendzierski
Masters Theses
A detailed investigation of selected mineralogical and textural characteristics of glacial deposits was conducted in order to explore the complex relationships between the Lake Michigan and Saginaw Lobe ice-margins and associated depositional regimes during the deglaciation of southwest Michigan. Various analytical methodologies were applied to the characterization of glacial materials, glacial and post-glacial environments in order to infer a chronology of lobate activity.
The Sturgis Moraine, located in St. Joseph County, Michigan, is a major recessional moraine owing to the processes of both the Lake Michigan and Saginaw Lobes. Analysis of geologic materials and examination of subsurface data along with …
Glacial Stratigraphy And Surficial Geology Of The Decatur, Lawrence, And Paw Paw U.S.G.S.7.5 Minute Quadrangles In Van Buren County, Michigan, Brian Bird
Masters Theses
The modern day landscape of Van Buren County Michigan was created by the advance and retreat of glaciers from about 13,000 to 20,000 years ago. The Lake Michigan Lobe of the Laurentide Ice Sheet sculpted southwest Michigan most recently. The sediments deposited by the glacier include diamicton, outwash sediments, and lacustrine deposits. The build up of sediment by the glaciers led to the construction of particular features such as moraines, till plains, and outwash fans. The huge amount of meltwater from the glaciers led to the erosion of channels throughout the area. In the area of this investigation the Ganges …
The Glacial Geology Of Southern St. Joseph County, Michigan, Linda Nicks
The Glacial Geology Of Southern St. Joseph County, Michigan, Linda Nicks
Dissertations
The objective of the dissertation was to map the glacial geology in southern St. Joseph County, Michigan. The surficial geology was divided into three distinct land systems which are moraine, outwash and fan deposits. The Sturgis Moraine is the most prominent feature transecting the study area from east to west. The topography is further dissected by southwest-trending channels interpreted as tunnel channels.
Thick accumulations of sand and gravel in the study area indicate that glacial meltwater deposition played a dominant role in shaping the landscape. Based on the relative size of the channels and outwash deposits, the largest contribution from …
Origin Of The Central Kalamazoo River Valley, Southwestern Michigan, Usa, Andrew Kozlowski
Origin Of The Central Kalamazoo River Valley, Southwestern Michigan, Usa, Andrew Kozlowski
Dissertations
Chapter I
Introduction
Southern Michigan's geomorphology is a testament to the glacial processes that buried and sculpted the landscape during the last glaciation. Many glacial landforms in southwestern Michigan, including the Kalamazoo River Valley, provide evidence that aids in understanding the chronology, ice dynamics and glacial processes that occurred in Michigan during the last ice age.
As the climate began to warm about 20,000 yr B.P. (Larson and Schaetzl, 2001) the extensive Laurentide Ice Sheet began to recede from its maximum southern position reached during the Late Wisconsinan (Figure 1). It was at this point that modem surficial drainage systems …
Slope Stability Analysis Of A Lake Michigan Coastal Bluff, Gregory Carlton Young
Slope Stability Analysis Of A Lake Michigan Coastal Bluff, Gregory Carlton Young
Masters Theses
Bluff failure along the Lake Michigan coast can be produced primarily by increased pore pressure from perched water tables above lacustrine clay deposits. To test this theory, a site in Allegan County, Michigan with alternating layers of sand, clay and glacial till was chosen for bluff failure monitoring. Historically, the site experiences sporadic massive failures as opposed to neighboring sites that show more regular and uniform displacements. Four pole and cable monitoring lines were measured bi-weekly from December 2001 to October 2003. Lake levels were low and no erosion of material at the base of the slope occurred. Slumps above …
Geosciences Newsletter - 2004, Department Of Geosciences
Geosciences Newsletter - 2004, Department Of Geosciences
Geological and Environmental Sciences News
Vol. 1, No. 29
- Mohamed Sultan, Chairperson
- Faculty News
- Emeriti News
- Department News
- Graduate Student News
- Awards & Graduations
- Alumni News
- Field Trips
- Outstanding Alumni Academy
- Special Honor
- New Faces in the Geosciences
The Effects Of Polychlorinated Biphenyls (Pcbs) On Nerve Growth Factor (Ngf) In The Developing Frog, Xenopus Laevis, Cari Delong
The Effects Of Polychlorinated Biphenyls (Pcbs) On Nerve Growth Factor (Ngf) In The Developing Frog, Xenopus Laevis, Cari Delong
Honors Theses
Polychlorinated biphenyls are ubiquitous, persistent environmental contaminants that cause a variety of adverse health effects wildlife and humans. PCBs are the major contaminant in the Kalamazoo River Superfund Site, in which the Environmental Institute is funded to study. Projects at the Environmental Institute are focused on developing molecular biotechnology tools that will improve environmental risk assessment. Previous acute studies involved the exposure of developing tadpoles, Xenopus laevis to PCBs through aquarium water in order to measure gene expression. Nerve growth factor (NGF) gene expression showed changes in these previous studies. NGF is a neurotrophic factor that regulates the growth and …
Chemical And Isotopic Investigation Of Groundwater In Eastern United Arab Emirates (Uae), Ahmed Ali Abdalla Murad
Chemical And Isotopic Investigation Of Groundwater In Eastern United Arab Emirates (Uae), Ahmed Ali Abdalla Murad
Dissertations
UAE is located at the southeast of Arabian Peninsula. Two main aquifers occupy the study area: the Eastern Gravel Plain and Ophiolite aquifer. Increasing salinity of groundwater and depletion of aquifers are a major concern in the UAE. Previous studies suggest that groundwater, particularly in the Eastern Gravel Plain aquifer, is affected by seawater intrusion and evaporation. Isotopes of oxygen, hydrogen, carbon and chlorine, and chemical analyses were used to investigate this problem in detail. Samples of groundwater from the Eastern Gravel Plain aquifer have R36Cl values in the range of 13.3 to 17.4 x10-15 while those …
Geochemical And Isotopic Characterization Of Shallow Basinal Brines From The Makgadikgadi Pans Complex, Northeastern Botswana: Determination Of The Sources Of Salinity, Loago N. Molwalefhe
Geochemical And Isotopic Characterization Of Shallow Basinal Brines From The Makgadikgadi Pans Complex, Northeastern Botswana: Determination Of The Sources Of Salinity, Loago N. Molwalefhe
Dissertations
Isotopes and chemical tracers have been used to constrain the sources and causes of salinity in shallow groundwater brine from the Makgadikgadi Basin, northeastern Botswana. The brine is massively rich in chloride and sodium, and moderately rich in carbonates, sulphate and potassium, and is distinctively poor in divalent cationic species. Various models that have been advanced to explain the origin of the brines include evaporative enrichment at the surface and density-induced infiltration, dissolution of evaporites, and trapped connate water.
This study presents the compositional variability and behaviors of ·the stable isotopes of carbon (S13C) and oxygen (S18 …
Geophysical Characterization Of A Former Refinery Site, Kalamazoo, Michigan, Baraka Damas Kinabo
Geophysical Characterization Of A Former Refinery Site, Kalamazoo, Michigan, Baraka Damas Kinabo
Masters Theses
Lakeside, a former refinery site, in Kalamazoo, Michigan, is contaminated with hydrocarbon products. The contamination resulted from the refining and storage activities that took place at the site for over 50 years. The contamination is scattered in isolated pockets.
In an attempt to better define the contamination zones and therefore assist the remediation efforts, this study uses shallow geophysical methods including Electromagnetic induction using the EM 31 system, Magnetic, Ground Penetrating Radar (GPR), and Resistivity methods. The hand auger was used to further characterize some EM 31 anomalies. The EM 31 conductivity results show elevated values resulting from the biodegradation …
Laboratory Testing Of Select Geotextiles As Biointrusion Barriers And Sediment Filters, David R. Beck
Laboratory Testing Of Select Geotextiles As Biointrusion Barriers And Sediment Filters, David R. Beck
Masters Theses
It has been proposed that placing a geotextile over sediments with adsorbed contaminants can prevent bioaccumulation of the contaminants in larger animals by isolating the benthic organisms living within these sediments from fish. In conjunction with a field study carried out at Gull Creek, a laboratory study testing two geotextiles as biointrusion barriers and sediment filters was conducted.
Constant-head permeameters were run for seven days using cores from the field study area with a geotextile placed over the cores. For biointrusion barrier tests, medium sand was placed over the geotextile and spiked with nutrients. Following each trial, benthic organisms in …
Geosciences Newsletter- 2003, Department Of Geosciences
Geosciences Newsletter- 2003, Department Of Geosciences
Geological and Environmental Sciences News
Vol. 1, No. 28
- Dear Alumni and Friends
- Faculty News
- Department News
- Awards and Graduations
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- Field Trips
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Application Of Geochemical Fingerprinting And Isotopes To Identity Landfill Gas Impacts To Groundwater, Eric E. Wallis
Application Of Geochemical Fingerprinting And Isotopes To Identity Landfill Gas Impacts To Groundwater, Eric E. Wallis
Masters Theses
Volatile organic compounds (VOCs) are detected in two groundwater monitoring wells (MW-60 and MW-62S) located along the northern, downgradient property line of the McGill Road Landfill (MRL) in Jackson, Michigan. Potential on-site sources for groundwater impact are two distinct landfill units at the MRL. Leachate chemistry suggested that landfill leachate was not the source of VOCs detected in groundwater. A potential source for VOCs was landfill gas. Sources of landfill gas in the vicinity of the impacted wells included the distinct MRL landfill units as well as the old Jackson County Landfill (JCL), located hydraulically downgradient from the impacted wells. …
Stratigraphy Of Lake Michigan Lobe Deposits In Van Buren County, Michigan, Steven P. Beukema
Stratigraphy Of Lake Michigan Lobe Deposits In Van Buren County, Michigan, Steven P. Beukema
Masters Theses
The surficial glacial deposits and landforms of Van Buren County were recently mapped at a 1:24,000 scale as part of a STATEMAP project. Several borings were drilled to supplement the surface data. Six of these borings were characterized in detail by means of gamma ray logging, textural analysis, and X-ray diffraction of the clay-sized fraction of the diamicton units.
Results from this study reveal two diamicton units at stratigraphically distinct positions that can be correlated across the county and that are separated by a thick sequence of lacustrine sediments. Correlation of diamicton and lacustrine units was accomplished by analyzing several …
A Geochemical Survey Of The Natural Waters Of Belize, Central America, Anthony D. Marfia
A Geochemical Survey Of The Natural Waters Of Belize, Central America, Anthony D. Marfia
Masters Theses
A geochemical survey of the natural waters in Belize, Central America was carried out to compliment routine water quality analysis and to identify processes affecting water quality. The objective of this research was to provide a geochemical assessment of natural waters throughout Belize by examining select major ions (Ca2+, Mg2+ , SO42-), and stable isotopes of carbon (13C), oxygen (18O) and hydrogen (2H).
The dominant geology relevant to this investigation comprises a varied landscape of carbonates and elastic sediments in a subtropical rainforest/savannah climate. Stable oxygen and hydrogen …
Geochemical And Isotopic Characteristics Associated With High Conductivities In A Shallow Hydrocarbon-Contaminated Aquifier, Franklyn D. Legall
Geochemical And Isotopic Characteristics Associated With High Conductivities In A Shallow Hydrocarbon-Contaminated Aquifier, Franklyn D. Legall
Dissertations
In-situ vertical resistivity probes (VRPs) deployed at a hydrocarboncontaminated site in SW Michigan showed high soil conductivities within the contaminated zone. Within this zone, different phases of hydrocarbon impact were recognized, namely, zones with residual and dissolved phase hydrocarbons (RDH) and zones where these phases coexist with free product (RDFH). Bulk soil conductivities were highest ( 12 to 30 mS/m) in the zone with RDFH compared to the RDH zone (10 to 25 mS/m). Groundwater chemistry and stable carbon isotope data from closely spaced vertical samples within the anomalous conductive zones were used to provide evidence for biodegradation and to …
Geoelectrical Response Of An Aged Lnapl Plume: Implications For Monitoring Natural Attenuation, Douglas D. Werkema Jr.
Geoelectrical Response Of An Aged Lnapl Plume: Implications For Monitoring Natural Attenuation, Douglas D. Werkema Jr.
Dissertations
The geoelectric stratigraphy at a site impacted with light non-aqueous phase liquids (LNAPLs) is investigated for its link to natural biodegradation, its contribution to the conductive model for aged (i.e. mature) LNAPL contaminated sites, and the relationship to the natural hydrologic regime. The highest conductivities (lowest resistivities) were observed in portions o f soils where LNAPL was in residual and free phase. Corroborating evidence from bacteria enumeration from soil close to the vertical resistivity probe (VRP) installations show orders-of-magnitude increase in both heterotrophic and oil degrading microbes at the depths where the conductivity was at a maximum. The coincidence o …